/*
 * Copyright (C) 2008 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect;

import com.google.common.annotations.GwtCompatible;

import java.io.Serializable;

import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * @see com.google.common.collect.Maps#immutableEntry(Object, Object)
 */
@GwtCompatible(serializable = true)
@ElementTypesAreNonnullByDefault
class ImmutableEntry<K extends @Nullable Object, V extends @Nullable Object>
        extends AbstractMapEntry<K, V> implements Serializable
{
    @ParametricNullness
    final K key;
    @ParametricNullness
    final V value;

    ImmutableEntry(@ParametricNullness K key, @ParametricNullness V value)
    {
        this.key = key;
        this.value = value;
    }

    @Override
    @ParametricNullness
    public final K getKey()
    {
        return key;
    }

    @Override
    @ParametricNullness
    public final V getValue()
    {
        return value;
    }

    @Override
    @ParametricNullness
    public final V setValue(@ParametricNullness V value)
    {
        throw new UnsupportedOperationException();
    }

    private static final long serialVersionUID = 0;
}
